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I'll be happy to help! If you are looking to use a different client along with or instead of Outlook, you can export your Outlook contacts into a .csv file. Many third party programs will allow you to upload a csv file, unfortunately the webmail clients available (Horde, RoundCube, and SquirrelMail) do not have a feature to import a csv file.

There is currently not a method I am aware of to sync up the address books, meaning if you add an address to one then it will automatically update the other. However if you load your current addresses into another client by exporting the csv, then in the future you can add any new contacts as needed on a case by case basis into each client. If you have any other questions, please let us know!